CUET · BIOLOGY · PYQ PAPER 2023

The first isolated restriction endonuclease was:

A BamH I
B Hind II
C EcoR I
D Hind III

Verified Solution

Answer & Solution

Correct Answer

(B) Hind II

Step-by-step Solution

Detailed explanation

Hind II

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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Read the given passage and answer the question.
ABO blood groups in human beings are controlled by the gene I. The plasma membrane of the red blood cells has sugar polymers that protrude from its surfaces and the kind of sugar is controlled by the gene. The gene (I) has three alleles IA, IB and I. The alleles IA and IB produce a slightly different form of the sugar while allele i does not produce any sugar. Because humans are diploid organisms, each person possesses any two of the three I gene alleles, IA and IB are completely dominant over I.
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LIST I	LIST II
A. Phenylketonuria	I. Incomplete dominance
B. Haemophilia	II. 9:3:3:1
C. Snapdragon	III. Pleiotropy
D. Dihybrid cross	IV. Sex-linked

List - I	List - II
(A) Leydig cells	(I) Human Chorionic Gonadotropin (hcg)
(B) Placenta	(II) Progesterone
(C) Corpus luteum	(III) Androgens
(D) Pituitary gland	(IV) Oxytocin